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6-11
6
0743-397
3. Tighten all engine mounting hardware in the
sequence used in step 1.
4. With all mounting hardware tightened, install the
drive clutch and the driven pulley; then repeat steps
2-3 of Checking Parallelism sub-section.
VERTICAL PARALLELISM (4-Stroke)
1. Remove the hood, left- and right-side access panels;
then remove the drive belt guard and drive belt.
2. With the driven pulley sheaves open far enough to
install the Drive/Driven Parallelism Bar into the
driven pulley so the parallelism bar lays vertical
between the driven pulley sheaves on the driven
cam.
3. Using a digital caliper, measure from the top back
(12 o’clock) of the drive clutch to the alignment bar.
4. Zero the digital caliper; then do the same procedure
(step 3) for the bottom side (6 o’clock) of the drive
clutch.
5. If drive clutch alignment is out of specification,
loosen the cap screw securing the engine bracket to
the front right engine mount enough to install an
appropriate number of engine shims to equal 1.270
mm (± 0.050 in.).
0745-193
6. Once the drive clutch offset is corrected. Tighten cap
screw to 25 ft-lb from step 5.
7. Install drive belt, drive belt guard, right- and left-side
access panels, and the hood.
DRIVE BELT DEFLECTION
Drive belt length, condition, and deflection are all impor-
tant for peak performance. To check and adjust drive belt
deflection, use the following procedure.
1. Turn the engine off; then open the access panel.
2. Make sure the drive belt is sitting at the top of the
driven pulley sheaves.
3. Place a straightedge on top of the drive belt. The
straightedge should reach from the drive clutch to the
top of the driven pulley.
4. Using a stiff ruler centered between the drive clutch
and driven pulley, push down on the drive belt just
enough to remove all slack. Note the amount of
deflection on the ruler at the bottom of the straight-
edge. The deflection should be at 1 1/4 in.
0743-319
NOTE: Push down on the belt with the ruler only
until the bottom of the belt flexes upward; then read
the amount of deflection.
5. To correct drive belt deflection, remove the sheave
adjuster from the pulley, remove or add shim wash-
ers to the adjuster, and install the adjuster.
NOTE: Adding shim washers will decrease belt
deflection; removing shim washers will increase belt
deflection.
NOTE: If the drive belt deflection is above specifica-
tions, the snowmobile will bog and lack power at
clutch engagement. For good performance, proper
belt deflection is critical.
6. Close the access panel.
Manual
Table of Contents
Summary of Contents for Sno Pro 120 2011
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